This versatile Glow in the Dark Stainless Steel Circular Barbell is crafted from 316L stainless steel and features an acrylic glow in the dark ball on one end. Externally threaded, this barbell is offered in 16G and 14G, with 3/8" and 1/2" inner diameters, perfect for nipple or septum piercings. Hold up to a light source to activate the glow.